Tube rolling machine



7, 1943- A. SZABO, JR

TUBE ROLLING' MACHINE 2 Sheets-Sheet 2 Filed Dec. 19, 1941 A T Tole/v5 Y Patented Dec. 7, 1943 TUBE ROLLING monnga Andrew Szabo, Jr., Loraimaohiou ApplieationDecember 19, 195.1; Serial Ng. 433,6!!6 :1

My invention relates. ,toan improved method for.. the manufacture ,ofseamless .or, weldless. steel .tubes and relates Iurther toimprovedmeche anismi used in the said method.

It islan object .of my invention to provide :an improved- .method formanufacturing, seamless or .weldless steel ,tubes ;-by means. .of i a -minimum umber, :ofoperations 1 and,.in-. a highly efilcient and economical manner.

Another object ofr my invention is. to provide an improved method for; manufacturing. seam- I less or. Weldless steel tub es wherein the-.tube when it is. passed through a piercing tope'rationf has uniform pressure exertedthereon whereby saidtube when it leaves the piercing, mechanism has awall of substantially; uniiorm thickness throughout;

Another object of my invention is to rprovide. animprovedcmethod for manufacturing, seamless ;or .weldless. ,steeltubes, in which. .the pierce ing and.rolling-mill operation may be concur-. rently: effected.

Another-object: of, my, invention is to :provide an improved method f or. manufacturing. seamlessror weldless, steel tubes. in ,which, the reeling r, operation.,may be eliminated, if desired.

Another. obi ect of, my;v invention -.is to more eflicientlyproduce ,a Q seamless steel vtube having; a uniform wall of thedesired. thickness through out.

Another object-pf my invention-is to provide an improyed method for straightening,- steelstubes,

Another objecttofv my-invention is.,to -provide; an improved methodfor straightening,steel tubes, accordingtaa cold proees s.. V

Further. :objectslof my; invention and {thee in: vention -itSeH-rwill'ubecome more readily apparent by reference to the specification hereof and the drawings, in which drawings:

Fig. 1 is a front elevational view partially in section showing the improved piercing and rolling mill machine of my invention;

Fig. 2 is a sectional view taken on the plane from the line 2-2 of Fig. 1;

Fig. 3 is a sectional view taken on the plane from the line 3-3 of Fig. 1; and

Fig. 4 is a top elevational view of the piercing and rolling machine of my invention.

Referring to the drawings, as illustrated in Fig. 1, the seamless tube forming machine of my invention, according to a preferred embodiment thereoLcomprises a piercing machine I and a rolling machine 2, the operation of said piercing and rolling machine being concurrently operating, said tube forming machine compris- 5 base.

beenzpierced;

ing a relatively large roller. 3 which. is ,.centrally positioned. mt e ,basenra millfhousing zlliisaid preferred embodiment of my invention shown in,

Fig. ,1 1 directly above thef, larger roller 3 and spaced! therefrom} saiderlati'vely. smaller roll'er 4 beingcmounted ,in .said'hou'sing ,2ll; by; means of ragbearingblock L. l 2.] At. either side; .offIsaid. rollers-.3 and 2.4 andl'spacedltherefrom. ia'fl pair, of,

rollers... 5 and-l 6 f, are .fdis'p'os'ed, 'salidffrollers ,being' mountcliin; bearing blocksi and; I31; in,, said. housing and .being,,' or. preferably the, same di; mensionsas said roller, 4,. the side rollers 5'1and] 6 being A preferably jinclinediatp fanliangle. to the center ,rollersl 3 land .4 and. spirally arranged men j respect to the axis of thelIbillt to'p'epassec: through the pass. a: in ,the. piercingmachi'ne .and

the resultant I tube; through the pass .tliev rolling,imachine, .saidlitube ban ing the form. of a, solidwround, billetf when introduced... into the piercing.,machine and. ,a.,seamlss, tube.. ,when in: troduced. into. .the.rolling machine after having It'js ,to; be understood ghowever that vany .pre,-,- frred mounting I 'of ithe. plijimfiti ofj'rollers vem played. in g ay, invention, could (be utilized, f', this. accordingto. any flwell known practicelpflmounfi ing such machines, for. examP it.-can .be' easily, understood that the ,illustrated mounting, -c'c' juld bereversed ,.,and the Z' larger roller? 3 mounted in.

the p osition shown forsth'el rollerA, the rollers.v 415landl 6 1 then being disposed QgeneIHIIlS'g i'. the, nd center .of, the, .milljhousihg; other}. ar

' rangements', ,might. also be .inade 'l'hrollrs .3 and 4i'a'refurthendisposedgat; an angle to the rollers 5 and 6 andspirally arranged with reference to the billet and the tube, hence the billet after being heated to a high forging temperature and then introduced between the relatively heavy rolls 3, 5 and 4, the same being disposed at an angle thereto is grasped by the revolving rolls 3, 5 and 4, rapidly revolved and pulled slowly forward as shown further in Figs. 2 and 4 while at the same time the metal is drawn away from the center to form a hole within said billet, the metal flowing over and about the mandrel 8 thus forming a tube 9.

After leaving the pass .12, the billet is placed in the pass ,1; between the rolls 4, 6 and 3, to have a further rolling operation performed thereon whereby the tube is elongated and rolled to smooth the outer surface, said rolling being accomplished over a mandrel M which supports the walls of the tube whereby the tube is reduced particular requirements of the job and the size billet to be processed. It is to be noted that in both the piercing and rolling operations; a three point contact is had by means of the particular i three rolls associated therewith and-that hencethe force exerted on said billet and'the resultant tube is uniformly distributed to revolve theibilleti,

and tube. V

Fig. 4, that an already pierced tube is being rolled in the reverse direction, as illustrated in Fig. 4', through the work pass y and that the rolls3 and 4, as above stated, operate concur-- rently on work piece in the work passes a: and 1 "It is understood that within the purview of my invention that the work passes a: and y may similarly be utilized for other operations on steel tubes or cylindrical work pieces of that type, for example a tube maybe pierced in the work pass :11? and rolled in the work pass y; also, the improved integral two-pass machine of my invention may be utilized for straightening tubes accordingto well known cold processe as well as for drawing and rolling.

j Hence it can be seen that rolls 3 and 4 operate concurrently in both, the piercing and rolling machines accomplishing a duality of purpose and also the speed of rotation of the roll 3 may be suitably variedand shortened with respect'to the speed of rotation ofthe relatively smaller rolls 5,

4 and 6., The preferred shape of said rollsis howeverthatshown in.Fig. 4jwherein the same are illustrated as being generally cone shape;the

surfaces composed of frustrums of two cones, theeration being extremely small and much less time" than formerly was consumed in taking a billet after it had been pierced out of apiercingmav I It is further 'to be noted that while one'billet is'beirig pierced inth'e work pass m, which is proceeding in the directionillustrated therefor in' Also, it is to be understood that although I have shown but one embodiment of my invention. that numerous and extensiye=departures may be made therefrom without departing however from the spirit of my invention as set forth in the appended claims.

I claim:

rality; of rolls, two of said rolls being disposed in centered relation to. said other rolls, said other rolls disposed laterally thereof, a pair of working passes'being formed between said center rolls and said laterally disposed rolls, each of said laterally disposed rolls being inclined atan angle to each of said center rolls-and spirally disposed with,re-'

spect to the axisof the work passes and of work pieces passing therethrough; each of aid center rolls and one of said laterally disposed rolls adapted to engage a workpiece passing through each separate work pass, said center rolls being simultaneously concurrently engaged in processing the two work pieces in the separate passes, one of said center rolls being relatively larger than said other rolls and adapted to exertrotating force on each of said work pieces, the speed of rotation of said'larger center roll'being relatively proportioned with respect to the speed of rotation of said other rolls, the said center roll being adapted to assist in exerting equal force upon each of the work pieces and to directions.

2'. In a seamless tube forming machine, a plurality ofrolls, two of said rolls'being disposed in centered relation to said other rolls, said other rolls disposed laterally thereof, a pair of Working passes being formed between said center rolls'and said laterally disposed rolls, each of aid laterally disposedrolls being inclined at an angle to-eachpropel the same in opposite 

